To change a percentage to a decimal, divide by 100. Change 48% to a decimal: 48 ÷ 100 = 0.48 To change a decimal to a percentage, multiply by 100. Change 0.67 to a percentage: 0.67 x 100 = 67% Wow!
When using chemical formula it is possible to calculate the percentage composition of the chemical. This can be useful when extracting metals from ores or when making fertilisers for specific plants.
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